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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 7,978  
Due after one year to five years 7,192  
Due after five years to ten years 969  
Due after ten years 15,811  
Total 31,950 $ 12,810 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 7,960  
Due after one year to five years 7,142  
Due after five years to ten years 974  
Due after ten years 16,396  
Total 32,472 $ 13,264
Available-for-sale Securities, Amortized Cost:    
Due within one year 0  
Due after one year to five years 0  
Due after five years to ten years 447  
Due after ten years 1,852  
Total 2,299  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 0  
Due after five years to ten years 434  
Due after ten years 1,763  
Total $ 2,197  
[1] Derived from audited consolidated financial statements.